Aperiodic and correlated disorder in XY-chains: exact results

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dc.creatorHermisson, Joachim
dc.date1998-08-21
dc.date.accessioned2026-07-07T03:11:21Z
dc.date.available2026-07-07T03:11:21Z
dc.descriptionWe study thermodynamic properties, specific heat and susceptibility, of XY quantum chains with coupling constants following arbitrary substitution rules. Generalizing an exact renormalization group transformation, originally formulated for Ising quantum chains, we obtain exact relevance criteria of Harris-Luck type for this class of models. For two-letter substitution rules, a detailed classification is given of sequences leading to irrelevant, marginal or relevant aperiodic modulations. We find that the relevance of the same aperiodic sequence of couplings in general will be different for XY and Ising quantum chains. By our method, continuously varying critical exponents may be calculated exactly for arbitrary (two-letter) substitution rules with marginal aperiodicity. A number of examples are given, including the period-doubling, three-folding and precious mean chains. We also discuss extensions of the renormalization approach to a special class of long-range correlated random chains, generated by random substitutions.
dc.description19 pages
dc.identifierhttps://arxiv.org/abs/cond-mat/9808238
dc.identifierhttp://arxiv.org/abs/cond-mat/9808238
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/28542
dc.subjectStatistical Mechanics
dc.subjectDisordered Systems and Neural Networks
dc.titleAperiodic and correlated disorder in XY-chains: exact results
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